Based on the economic preconditions and chemistry of the process, the most acceptable method consists in leaching of vanadium in weak acid medium by sulfur dioxide. Information about reductive leaching of pure five-valent vanadium (V 2 O 5) by Na 2 SO 3 is provided in the work of Tavakolikhaledi (2014).
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Importantly, the use of Mesa's highly efficient sulfur dioxide leach process, to generate manganese sulfate electrolyte from manganese oxide ores, will allow the use of much lower ore feed grades than could be tolerated in any roasting based process. (Roasting is currently used as a means of reducing manganese ores and thereby rendering them ...
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The sulfur dioxide partial pressure could affect the solubility of sulfur dioxide in water, which further influenced the redox rate. The effects of sulfur dioxide partial pressure on the indium leaching efficiency are shown in Fig. 7 (a). The indium leaching efficiency increased from 77.70% at a partial pressure of 0.10 MPa to 93.17% at 0.30 MPa.
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Cobaltic oxide minerals are readily dissolved in mildly acidic sulfuric solutions provided a reducing agent is also present. Sulfur dioxide is the most common reductant recommended for this purpose, but its addition during the leaching step could lead to significant environmental problems and could affect the recovery of copper if present in …
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Use of sulphur dioxide as reducing agent in cobalt leaching iron 1 mg/l to form a pulp of density 1.6 kg/l. A volume of 1000 ml of the pulp was used in each test.
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The effects of partial pressure of sulfur dioxide on cadmium leaching rate were presented in Fig. 8 (a). The cadmium leaching efficiency ascended from 58.46% at the partial pressure of 50 kPa–99.13% at 200 kPa. The dissolved sulfur dioxide also provides acid based on reaction (2) and contributes to (3), (4). Besides, the promotion of the ...
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Corpus ID: 29823217; Use of sulphur dioxide as reducing agent in cobalt leaching at Shituru hydrometallurgical plant @article{Mwema2002UseOS, title={Use of sulphur dioxide as reducing agent in cobalt leaching at Shituru hydrometallurgical plant}, author={K. Mwema and M. Mpoyo and M. Kafumbila}, journal={Journal of The South African …
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Among these processes, the leaching with sulfur dioxide is proved promising attributing to the advantages of fast leaching rate (Abbruzzese, 1990;Naik et al., 2000Naik et al.,, 2003, high Mn ...
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Acid leaching is applied in hydrometallurgy by using inorganic acids for the dissolution of ores, e.g., oxide ores such as limonitic laterites. Sulfuric acid can also be generated by sulfur-oxidizing bacteria or archaea if elemental sulfur is added to the process, or in the case of metal sulfides from the sulfur moiety of the mineral being ...
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The residue from desulfurization and denitrification of exhaust gas treatment process with pyrolusite ore as absorbent is regarded as a potential source of iron and manganese. In this study, an extraction process is proposed for recovery of iron and manganese with ammonium sulphate roasting followed by sulphuric acid leaching. Firstly, the conversion …
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Cobaltic oxide minerals are readily dissolved in mildly acidic sulfuric solutions provided a reducing agent is also present. Sulfur dioxide is the most common reductant …
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In addition, pressure leaching of copper slag containing 4.03% Cu, 0.48% Co, and 1.98% Ni at 130 • C have resulted in significant recoveries of Cu, Co, and Ni, amounting to 90% [24]. Leaching ...
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The use of sulphur dioxide as reducing agent was then investigated in order to reduce operating cost. This reagent also presents the advantage of sulphuric acid production during the leaching process. It has been added in the leaching vessel (tank). From the laboratory and industrial tests, selective leaching of cobalt (78%) has been performed.
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A previous study had documented that dithionic acid could decompose into sulfuric acid and sulfur dioxide merely under the condition of heating or at high concentration [].In the acidic liquid, H 2 SO 4 and SO 2 were proved to be the transformation products of MnS 2 O 6, indeed, the decomposition rate of MnS 2 O 6 could depend on …
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The optimal reductive leaching conditions were determined as 120 g/L H2SO4, 200 kPa sulphur dioxide partial pressure, a liquid-to-solid ratio of 8 mL/g and a stirring speed of 500 r/min at 105°C ...
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PDF | On May 1, 2010, Goutam Das and others published Superior atmospheric leaching of various West Australian laterites in the presence of sulphur dioxide | Find, read and cite all the research ...
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Although the addition of sulphur dioxide during leaching has been reported to accelerate the AL of lateritic ores (e.g. Weston, 1974b, Subramanian and Glaum, ... In …
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Bioleaching uses the iron- and sulfur-oxidising metabolisms of acidophilic microorganisms to extract metals from ore. Sulfur oxidation is a complex, multi-step process that is facilitated by a large number of enzymes, as demonstrated by the most complete model of sulfur oxidation in the extremophile A. ferrooxidans.
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The average content of leach agent in the first three days of leaching was about 1-2% SO2, corresponding to a sulfur dioxide consumption in the range of 65-85%. In contrast, in the last few days the sulfur dioxide concen- tration in the effluent was about 4% SO2 with a reagent consumption of around 30-35%.
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The treatment of copper-cobalt-bearing ores by hydrometallurgical process requires a preliminary leaching step. However, ... Sulfur dioxide: a versatile reagent for the processing of cobaltic oxide minerals. JOM, 60 (10) …
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It has been reported that the addition of a reducing agent such as sulphur dioxide (SO 2) facilitates the acid dissolution of laterite ore giving high recovery of nickel and cobalt (Das et al., 1997a, Kittelty, 2008). Leaching of various iron oxide minerals such as goethite, magnetite and hematite has also been reported in several studies using ...
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The leaching rates depended upon the sulfur dioxide flow rates, particle size, acid concentration and agitation. Both Mn and Zn dissolution with 0.1 M H 2 SO 4 at a SO 2 flow rate of 200 mL min −1 was nearly with a low Fe dissolution of 10% in 15 min of leaching of the fine fraction ( Fig. 7 b).
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The industrial test works conducted at the Shituru plant The results shown in Figure 1 clearly indicated that aimed: iron 1 mg/l to form a pulp of density 1.6 kg/l. A volume of 1000 ml of the pulp was used in each test. Gas, 20% SO2 in Figure 1—Copper and cobalt leaching recovery as function of time.
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The use of reducing agents is essential for the acid leaching of cobalt(III)-bearing ores. They reduce cobalt(III) to the cobalt(II) which is of the leachable form and, consequently, the dissolution rate of cobalt increases [1,2,3].Sodium metabisulfite (SMBS) is one of the most commonly recommended reducing agents [1, 3], but its addition during …
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The agglomerate and those cured present a greater importance in the treatment of copper sulphide ores. The CuproChlor® pretreat-ment process (calcium …
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Aqueous SO 2 leaching studies of Nishikhal manganese ore containing 32.5% Mn and 16.5% Fe were carried out at atmospheric pressure and room temperature using H 2 SO 3.The variables considered were SO 2 concentration, solid-to-liquid ratio, sulphuric acid concentration and duration of leaching. Regression equations for …
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Irons, K., 2006. An acid heap leach process my prove more costeffective than conventional nickel production technologies. Materials World 14 (2), 28–30. Jay, W., 2005. Process for refining lateritic ore. ... Preferential …
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The hydrometallurgical process begins with the leaching of metals using acids as leaching agents and oxidants. Some examples include 1) mineral acids such as H 2 SO 4, HNO 3, and HCl, with the ...
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It also causes environmental problems due to the continuous generation of air pollution and sulphur dioxide (SO 2) emissions [2,3]. Despite this, the projections made by the ... Another effect of curing is that it can reduce the passage of silica in the leaching …
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